Car Stuff and Self Doubt

I've been having fun with my water pump lately. I finally got that last nut off. Then after looking at it I decided to take off the engine housing that it was sitting on. I'm glad I did, because I would have had to take it all apart again. The gasket was so corroded that I went and got a replacement. After replacing that, I decided to take the splitter hose off (for the heater core and lower radiator lines) and resealed that with silicon base cement. All I have to do is take the pulley off the old pump, put it on the new, and put the pump on the housing. Not that anyone cares.
Anyways, I've been thinking a lot about people who do things like heal or lead great masses of people to Christ. I wonder what kind of struggles they have, whether or not they experience doubt, or how they cope with being in the spot light. After so many people telling me that "God has great things in store for [me]" and wondering what it is that's going to be, I might possibly have a glimpse. I never worried about it, but now there is so much apprehension, and so many more questions. Where do I begin? Somehow, I don't think I will have a choice, really. It's going to happen no matter what.